Constantin Mayer

University of Duisburg-Essen | uni-due · Sports orthopeadic Surgery

Field hockey, a physically demanding Olympic sport, carries a high risk of lower limb injuries, yet data on injury risk in elite field hockey are limited. Functional knee stability is important for injury prevention and a safe return to sport. This study is the first to investigate functional knee stability in elite field hockey, considering gender...

Background Return to sport testing is an established routine, especially for athletes who have ruptured their anterior cruciate ligament (ACL). Various tests are performed, often combined in test batteries, such as the Back-in-action (BIA) test battery. Unfortunately, pre-injury performance is often unknown, and only few athletes pass the high dema...

Bone-tendon junctions are prone for acute trauma due to its structural weakness, especially in premature males. For the lower limb, the most eminent area is the tibial tubercle apophysis. Osgood Schlatter disease (OSD) due to repetitive trauma or epiphyseal fractures due to one trauma is well described in literature and known in pediatric practice....

Zusammenfassung Inline-Skaterhockey ist eine aus dem Eishockey entstandene Sportart, die in Deutschland von ca. 6000 Sportlern ausgeübt wird. Es gibt allerdings einige Unterschiede zum Eishockey, die zu einem besonderen Risikoprofil der Athleten führen. Alle 315 aktiven Spieler der deutschen Inline-Skaterhockey-Bundesliga 2018 und 2019 wurden onlin...

Purpose Orthopaedic scores are essential for the clinical assessment of movement disorders but require an experienced clinician for the manual scoring. Wearable systems are taking root in the medical field and offer a possibility for the convenient collection of motion tracking data. The purpose of this work is to demonstrate the feasibility of aut...

The return to sport after knee injury is challenging. This is cruel for sports with a high incidence of injuries, such as team handball. Various tests guide decision making, but often, the athlete`s preinjury performance of these measures remains unknown. Moreover, objective return to sport criteria of a matching population are missing. The purpose...

Background Humerus fractures play a major role in daily clinical routine, and subsequent osteonecrosis is common after osteosyntheses.Objectives The current paper highlights the incidence and cause of osteonecrosis after proximal humerus fractures, with respect to presentation of anatomy and risk factors.Methods Display of the literature and therap...

Bone substitutes have been applied to treat osseous defects for a long time. To prevent implant related infection (IRI) and enhance bone healing functionalized biomaterials, antibiotics and osteoinductive substances have been introduced. This study gives an overview of the current available surface-coated bone substitutes and provides an outlook fo...

Handball is one of the most traumatic sports. The knee is the most commonly injured joint. To prevent knee injuries, optimal functional knee stability is of great importance. Nevertheless, there is still no consensus about objective criteria for knee function. Depending on playing class, injury rates seem to differ. The purpose of this study was to...

Introduction Introducing a new arthroplasty system into clinical routine is challenging and could have an effect on early results. Since UKA are known to have failure mechanisms related to technical factors, reliable results and easy adoption are ideal. The question remains whether there are differences in objective procedure parameters in the earl...

Background Handball is one of the most popular team sports in Germany, as well as one of the most dangerous ones. Injury rates in Germany are higher amongst handball professionals than in soccer, with the knee being the most commonly injured joint. To prevent injuries, a functional inert stability is necessary, but definitions and objective measure...

Purpose Despite the great evolvement of sports medicine, there is still a lack of consensus among sports physicians regarding the decision of return to sports after knee injury, especially in non-elite sports. Currently, no sport-specific reference data for an objective reliable evaluation of functional knee stability exist. The purpose of this stu...

›Osteoarthritis (OA) of the hip and knee joint is a common disease worldwide and is associated with chronic disability and progressive pain. Currently, the most suitable treatment method in end-stage OA is surgical restoration by total joint replacement (TJR). ›In this regard, patients’ suffering from end-stage OA and waiting for TJR intervention a...

Zusammenfassung Verschiedene Untersuchungen in den vergangenen Jahren haben gezeigt, dass innerhalb der Ballsportarten Handballspieler einem besonders hohen Verletzungsrisiko ausgesetzt sind. Dabei ist das Kniegelenk die am häufigsten verletzte Körperregion und ein Riss des vorderen Kreuzbandes die häufigste Verletzung am Knie. Um Folgeschädigungen...

Purpose The tensiomyography (TMG) technique is increasingly used to determine muscle contractile properties in exercise and injury management. The present study investigated the informative value of TMG parameters in correlation with commonly used (creatine kinase, CK; myoglobin, Mb) and novel candidate biomarkers of muscle damage (heart-type fatty...

The purpose of this study was to investigate if ischemic preconditioning (IPC) prior to eccentric exercise of the elbow flexors leads to alterations in muscle oxygen saturation (SmO2) during loading. Additionally, parameters of muscle damage, like serum creatine kinase, were assessed following the loading protocol. Nineteen untrained males were all...

The digitalization in medicine has led to almost universal availability of information to different healthcare professionals and accelerated clinical pathways. Fast-track concepts and short hospital stays require intelligent and practicable systems in preventive and rehabilitation medicine. This includes optimization of movement analysis by innovat...

Osteoarthritis (OA) is the most frequently diagnosed joint disorder worldwide with increasing prevalence and crucial impact on the quality of life of affected patients through chronic pain, decreasing mobility and invalidity. Although some risk factors, such as age, obesity and previous joint injury are well established, the exact pathogenesis of O...

Zusammenfassung Hintergrund: Mixed Martial Arts (MMA) ist eine Kombination verschiedener Kampfsportarten. Akute Verletzungen sind bekannt und in der Literatur allgemein beschrieben. Nichtsdestotrotz gibt es kaum Erkenntnisse über degenerative Veränderungen am muskuloskelettalen System. Das Ziel dieser Studie war die Bestimmung des Einflusses von be...

Background Wear debris is a major factor in aseptic loosening of total hip arthroplasty. UHMWPE inlays are known for significant wear, and the following generation, HCLPE), has shown promising in vitro and short-term in vivo results. This study aimed to investigate wear debris of HCLPE liners with ceramic heads after 9 years to reveal the in vivo w...

Osteoarthritis of the knee is one of the most commonly diagnosed joint ailments and responsible for increased rates of total knee arthroplasty surgeries worldwide. Whereas the surgical approach is able to diminish the perceived knee pain of concerned patients’, the postoperative recovery is often accompanied by persistent skeletal muscle dysfunctio...

Ischämische Präkonditionierung (IPC) beschreibt eine Interventionsstrategie zur Erhöhung der Widerstandfähigkeit von Organen und Geweben gegenüber längerer ischämischer Disposition und folgenden Reperfusionsschädigungen (I/R-Injury). Die gewollten Anpassungen werden durch die vorhergehende Applikation kurzzeitiger Ischämiephasen hervorgerufen. In d...

Purpose: Ischemic preconditioning (IPC) is known to reduce muscle damage induced by ischemia and reperfusion-injury (I/R-Injury) during surgery. Due to similarities between the pathophysiological formation of I/R-injury and eccentric exercise-induced muscle damage (EIMD), as characterized by an intracellular accumulation of Ca, an increased produc...

Purpose: Advantages of tourniquet use in TKA include benefits for surgeons and patients, varying from a bloodless operation site to a reduced intervention time. The time under ischemia and the reperfusion period are crucial phases for affected soft-tissue, most commonly the extensor mechanism. Case reports: documented its impact on soft-tissue,...

Eccentric exercise training is effective for increasing muscle mass and strength, and improving insulin sensitivity and blood lipid profiles. However, potential muscle damage symptoms such as prolonged loss of muscle function and delayed onset of muscle soreness may restrict the use of eccentric exercise, especially in clinical populations. Therefo...

Purpose: Rotational alignment of prosthetic components after total knee arthroplasty (TKA) is predominantly monitored with computer tomography (CT), for example by relating the anatomical transepicondylar axis (a-TEA) of the native femur to the posterior bicondylar axis of the prosthetic component (PBCA). The purpose of the present study was to po...

Purpose The aim of this study was to investigate the incidence of hyponatremia during 28 days of high volume rowing training. Methods 30 members of the German junior rowing team (21 males, 9 females) were studied during a training camp of four weeks duration. Serum sodium ([Na + ]) and osmolality were assessed at baseline before entering the traini...

To investigate the incidence of hyponatremia and its relationship to plasma copeptin, a surrogate marker for arginine vasopressin (AVP) during 28 days of high volume rowing training. Thirty rowers of the German junior national team (21 male) were studied during a training camp. Serum sodium ([Na(+)]), osmolality, and copeptin were measured before t...